The environments of Ly α blobs - I. Wide-field Ly α imaging of TN J1338-1942, a powerful radio galaxy at <i>z</i> ≃ 4.1 associated with a giant Ly α nebula

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dc.contributor.authorSaito, Tomoki
dc.contributor.authorMatsuda, Yuichi
dc.contributor.authorLacey, Cedric G.
dc.contributor.authorSmail, Ian
dc.contributor.authorOrsi, Alvaro
dc.contributor.authorBaugh, Carlton M.
dc.contributor.authorInoue, Akio K.
dc.contributor.authorTanaka, Ichi
dc.contributor.authorYamada, Toru
dc.contributor.authorOhta, Kouji
dc.contributor.authorDe Breuck, Carlos
dc.contributor.authorKodama, Tadayuki
dc.contributor.authorTaniguchi, Yoshiaki
dc.date.accessioned2025-01-23T21:38:00Z
dc.date.available2025-01-23T21:38:00Z
dc.date.issued2015
dc.description.abstractWe exploit wide-field Ly alpha imaging with Subaru to probe the environment around TN J1338-1942, a powerful radio galaxy with a > 100 kpc Ly alpha halo at z = 4.11. We used a sample of Ly alpha emitters (LAEs) down to log (L-Ly alpha [erg s(-1)]) similar to 42.8 to measure the galaxy density around TN J1338-1942, compared to a control sample from a blank field taken with the same instrument. We found that TN J1338-1942 resides in a region with a peak over-density of delta(LAE) = 2.8 +/- 0.5 on scales of 8 h(-1) Mpc (on the sky) and 112 h(-1) Mpc (line of sight) in comoving coordinates. Adjacent to this overdensity, we found a strong underdensity where virtually no LAEs are detected. We used a semi-analytical model of LAEs derived from the Millennium Simulation to compare our results with theoretical predictions. While the theoretical density distribution is consistent with the blank field, overdense regions such as that around TN J1338-1942 are very rare, with a number density of 6.4 x 10(-8) Mpc(-3) (comoving), corresponding to the densest < 0.4 percentile at z similar or equal to 4.1. We also found that the Ly alpha luminosity function in the TN J1338-1942 field differs from that in the blank field: the number of bright LAEs (log(L-Ly alpha [ergs(-1)]) greater than or similar to 43.3) is enhanced, while the number of fainter LAEs is relatively suppressed. These results suggest that some powerful radio galaxies associated with Ly a nebulae reside in extreme overdensities on similar to 3-6 Mpc scales, where star formation and AGN activity may be enhanced via frequent galaxy mergers or high rates of gas accretion from the surroundings.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stu2538
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stu2538
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101585
dc.identifier.wosidWOS:000350273400008
dc.issue.numero4
dc.language.isoen
dc.pagina.final3086
dc.pagina.inicio3069
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: evolution
dc.subjectgalaxies: formation
dc.subjectgalaxies: high-redshift
dc.subjectgalaxies: individual: TN J1338-1942
dc.titleThe environments of Ly α blobs - I. Wide-field Ly α imaging of TN J1338-1942, a powerful radio galaxy at <i>z</i> ≃ 4.1 associated with a giant Ly α nebula
dc.typeartículo
dc.volumen447
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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